Lawn-mower sharpener.



N0. 592,846. l Patented Feb. Il., |902.

V`W. H. GILBERT. j

LAWN MWEB SHAPENER.

' mrzl 1901.

(Apphcatxon 511; 1 uulml lnm ll-llllunl-llllllllllllI-llllllllllllliur l UNITED STATES PATENT OFFICE.

WI'LLL-iMn. GILBERT, or' TOLEDo, omo,

I Awl\1l\/1owlanA SHARPENER.

srncinrearron forming fait of Letters Patent No. 692,846, daten ynessi-way,- 11, 1902.

Application filed March 21,1901.

T0 a/ZZ whom it may concern.- i

Be it known that I, WILLIAM H. GILBERT, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Lawn-Mower Sharpeners, of which the following is a specification.

My invention relates to means for sharpening the knives or cutters of a rotating cutterhead, such as may be found in lawn-mowers and other apparatus, and comprises a lawnmower with a sharpening device, as a tile or hone, a carrier therefor, and means for reciprocating the carrier so as to bring the sharpening device into the path of theedges of the knives of the mower and to carry it along the same during the rotation of the cutter-head, as fully set forth hereinafter and as illustrated in the accompanying drawings, in which-'- i Figure lis a plan view of a lawn-mower embodying my invention. Fig. 2 is a crosssectional elevation. Fig. 3 is a detail sectional view of the oscillating tongue.

The frame of xthe mower is suitably constructed to support the lower stationarycutter-blade a and the shaft b of the revolving cutter M, provided with the usual spiral knives d, and the fra-me has bearings for the drive-wheels f, both of which carry gears engaging with pinions e on the cutter-shaft b.

Across the frame extends the usual connecting-rod B. To the structure thus constructed I apply my sharpening or truing device in the form of a file or Ihone C, with a reciproeating carrier therefor, which supports the said device, which I shall hereinafter term the file, in position to make contact with the edges of the rotating knives, so that as the carrier reciprocates the knife-edgesvwill be brought to their proper alinement and sharpened so as to maintain them in effective condition or so as to bring them to effective condition if they are dull. u A

Any suitable carrier may be employed for supporting and moving the legbut, as shown, I make use of a carrier G, having at one end a recess for a cross-threaded drivingshaft or screw N. In order that the carrier G may be reciprocated by means of the crossthreaded shaft N, means are provided, as a screw p, passing through the head of the car` ,seal Ng. 52,20%. (No maat-,1.3

said screw, thereby tending to reduce fricrierand having a tongues yextending into tion during the reciprocationsof the carrier.

The shaft N is provided at both ends with f riction-p ulleys h, each of which bears against the edge of one of the wheels f, the shaft N turning ina linkn, hooked to engage the shaft and also to engage the connecting-rod B, so that the pulleys h will, with their shaft N, swing about the Arod B, maintai-ning'the contactv between the pulleys and the wheels f, which thus serve, as the machine is propelled forward, to impart rotation to the shaft N and reciprocation to the carrier Gr. 'y The file C is preferably supported on the carrier through the vmedium of a fork t, secured by a set-screw q, so as to be adjustable back and forth,and between the outer ends of the fork is a cross-bolt r, to which the file C is connected, so that as the cutter rotates the knives thereof may be brought into contact with and sharpened by the flle.

y It will be obvious that in applying my in'- ventionto mowers or machines of different kinds the carrier and itsoperating means will be differently constructed, and Iv therefore do not limit myself to the precise con struction herein set forth.'

Without limiting myself to the precise constructionand arrangement of parts shown, I claim as myinvention- 1. In a lawn-mower the combination with he cutter-head and its knives, of an attachment for sharpening said knives, which consists of a sharpening device, a carrier therefor, and means actuated by the wheels of the lawn-mower, whereby the carrier is automaticall y reciprocated laterally to carry the sharpening device thelength of the knives, substantially as described.

2. The combination in a lawn-mower, of the rotating cutter-head, a cross-threaded driving-shaft, a carrier arranged to be reciprocatedl thereby, a sharpening device and means adjustably supported by the carrier for suspending the sharpening device,`sub stantially as described.

3. The combination in a lawn-mower, of a rotating cutter-head and its knives, a sharp- IOC) ening device for sharpening the knives, a carrier, means adjustably supported by the carrier for suspending said sharpening device, and a shaft having reverse threads and a tongue oscillating on the carrier and engaging said threads, with means actuated by the Wheels of the lawn-mower for rotating the shaft, substantially as described.

4. The combination in a lawn-mower, of a rotating cutterhead, connecting-rod B, a shaft having reverse threads turning in links swinging about said connecting-rod and provided With pulleys bearing on the drivingwheels of the mower, a carrier through which the threaded shaft passes, provided with the oscillating tongue engaging the screw-thread, 

